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Type 4 heads
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brinleydavis
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PostPosted: Sat Apr 17, 2021 8:07 pm    Post subject: Type 4 heads Reply with quote

Hi everyone!! Back at it after a long, unproductive winter, and back to rebuilding my type 4 for my bay! I’m reassembling now, while watching old bug me DVDs that my dad had, and everything is going smoothly!
Looking for someone that is able to give me a better idea of the condition of my valve seats.
Both heads are pretty even as far as wear goes, and I’m rebuilding this more as a fun project than a serious build. That being said, i do want to do a good enough job that I won’t be stranded with a green bus somewhere lol. Here’s some pictures, any info will help.
Also, there seems to be more wear on one side than the other, you’ll see what I mean in the pictures. Does anyone have an idea of what would be causing this? Thanks!!

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aeromech
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PostPosted: Sat Apr 17, 2021 9:13 pm    Post subject: Re: Type 4 heads Reply with quote

Those heads are a hand grenade ready to blow. If you try to use them you’re risking catastrophic engine failure.
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Wildthings
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PostPosted: Sun Apr 18, 2021 1:18 am    Post subject: Re: Type 4 heads Reply with quote

aeromech wrote:
Those heads are a hand grenade ready to blow. If you try to use them you’re risking catastrophic engine failure.


Those heads have already seen a catastrophic engine failure or two.
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udidwht
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PostPosted: Sun Apr 18, 2021 4:07 am    Post subject: Re: Type 4 heads Reply with quote

Into the scrap pile.

New AMC castings or nothing.
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alman72
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PostPosted: Sun Apr 18, 2021 7:01 am    Post subject: Re: Type 4 heads Reply with quote

those heads on your "fun" engine would surely cut down on the fun. if you want to keep it fun, use any heads but those.
ALso, everyone on here is going to tell you to have any heads redone /looked at by a pro, and you will never get a "looks good!' run them!" unless you do an unboxing from len hoffman.
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Wildthings
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PostPosted: Sun Apr 18, 2021 8:23 am    Post subject: Re: Type 4 heads Reply with quote

What typically kills Type 4 heads is either the seats coming loose and wearing their way down into the soft aluminium of the heads, cracking through the spark plug hole or exhaust port, or all of the above.

If the seats are tight and there is no cracking (both unlikely) you might be able to have a shop replace the guides and the exhaust valves and get years out of them if you are only driving a couple of thousand miles a year, but if you are hoping to drive 10K miles per year, you will be back in there soon to replace them so you might as well drop the big bucks now.
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BerneseMtnDog
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PostPosted: Sun Apr 18, 2021 1:49 pm    Post subject: Re: Type 4 heads Reply with quote

When I unboxed my heads from Len Hoffman it felt like Christmas and they were a thing of beauty. No regrets dropping the bucks on those heads.

Steve
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alman72
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PostPosted: Mon Apr 19, 2021 6:04 am    Post subject: Re: Type 4 heads Reply with quote

BerneseMtnDog wrote:
When I unboxed my heads from Len Hoffman it felt like Christmas and they were a thing of beauty. No regrets dropping the bucks on those heads.

Steve


sounds great! run them!
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brinleydavis
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PostPosted: Wed Apr 21, 2021 5:18 pm    Post subject: Re: Type 4 heads Reply with quote

Thank you everyone!! Although not the news I wanted, I figured that’s what I’d be getting back. I have one more type 4 engine sitting here that might be in better condition. I’m hoping, since new heads are so expensive! Has anyone ever heard of re seating the valve seats? Another set I have are in better condition, but the one seat is slightly popped out!
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busdaddy
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PostPosted: Wed Apr 21, 2021 6:31 pm    Post subject: Re: Type 4 heads Reply with quote

brinleydavis wrote:
Another set I have are in better condition, but the one seat is slightly popped out!

Suck it up and let the moths out of your wallet, those heads are cooked too, spend now, or spend more later on the side of the road.

There's a few must do's on most cars, brakes and steering for example, type 4 bus owners also get a bonus "must do" on their list, and that's heads.

Idea Hint:, it's much more pleasant replacing them in your driveway than in the middle of nowhere. Idea
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Wildthings
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PostPosted: Wed Apr 21, 2021 10:20 pm    Post subject: Re: Type 4 heads Reply with quote

brinleydavis wrote:
Has anyone ever heard of re seating the valve seats? Another set I have are in better condition, but the one seat is slightly popped out!


You could have larger valves and matching larger seats installed, but if you are going to spend that kind of money, why spend it on old worn out heads?
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raygreenwood
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PostPosted: Thu Apr 22, 2021 10:13 am    Post subject: Re: Type 4 heads Reply with quote

Sure....you could make decent set of worn out heads...just like new.....but you may not be able to afford it.

You can have the cylinder seats re-machined....any cracks welded....new oversized seats installed....new studs and threads....thread inserts for the spark plug holes. You will need new oversized valve guides.

BUT....after welding and before machining and installing seats and new studs....the heads would have to be annealed. That is what makes the heads ....just like new....aside from cracks.

Not many shops around that still anneal heads except racing shops. Its not hard. You just need to have the oven and the experience/knowledge.

It may be cheaper to buy new castings. Ray
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